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Lecture 7

Lecture 7

3 Pages
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Department
Environmental Science
Course Code
EESA09H3
Professor
Tanzina Mohsin

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Lecture 7: Thermal Winds
Land /Sea Breeze
Temperature contrast between land and water
Temperature changes from day to night
Toronto- Great Lakes, for us it is land/lake breeze
Figure 1.1 Local wind circulation- thermal wind
oBottom one is lake breeze
Thermally induced circulation because of temperature contrast between land and sea
With 1km, small scale
Sea breeze
During day, land is warmer than water
Warm air rises, cold air sinks- air over land mass rises, then sinks over water b/c temperature
colder, puts up moisture and move over land
When isobars largely spaced, on land, closely spaced on water, means land air moves to water
Sea breeze front
Sea breeze can creates sea breeze front and can cause local precipitation
Downtown sees more precipitation than Markham esp. over summer time due to land/sea contrast
Land breeze
Water is warmer than land
As night falls, all heat on land is given up quickly
Water cannot cool down quickly like land
Air moves over water, air is from land to water, known as land breeze
This is night time phenomena
Land/sea breeze
Thermal breezes from Great Lakes Region
We are in great lakes region
Most of manmade lakes associated with great lakes region
Land/sea contrast
Night, warm air rises over water, moves over land, sinks at land
Thermal breeze, Florida
See this type of landscape mostly in tropics
Example of thermal breeze
Moisture causes thunderstorms, mainly during summertime
Sea breeze frequency
Summertime have most sea breeze
July is highest, starting from May-Sept, mostly see land/sea breeze
Monsoon
Same process, only difference is largely scale
Continental scale phenomena
Associated with oceans- huge water bodies
All seasons
Seasonal scale thermal wind, result of temperature contrast between land and water
Asian Monsoon- impacts India, Asian
Summer time Monsoon most famous
Summer Monsoon
Mostly impacts Asia
All oceans zones around associated with Monsoon
Summer, land mass warmer than water
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Description
Lecture 7: Thermal Winds LandSea Breeze Temperature contrast between land and water Temperature changes from day to night Toronto- Great Lakes, for us it is landlake breeze Figure 1.1 Local wind circulation- thermal wind o Bottom one is lake breeze Thermally induced circulation because of temperature contrast between land and sea With 1km, small scale Sea breeze During day, land is warmer than water Warm air rises, cold air sinks- air over land mass rises, then sinks over water bc temperature colder, puts up moisture and move over land When isobars largely spaced, on land, closely spaced on water, means land air moves to water Sea breeze front Sea breeze can creates sea breeze front and can cause local precipitation Downtown sees more precipitation than Markham esp. over summer time due to landsea contrast Land breeze Water is warmer than land As night falls, all heat on land is given up quickly Water cannot cool down quickly like land Air moves over water, air is from land to water,
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